package io.renren.utils.spring;

import io.renren.utils.StringUtils;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;


/**
 * spring工具类 方便在非spring管理环境中获取bean
 *
 * @author jeethink
 */
@Component
public final class SpringUtils implements BeanFactoryPostProcessor, ApplicationContextAware {
   /**
    * Spring应用上下文环境
    */
   private static ConfigurableListableBeanFactory beanFactory;

   private static ApplicationContext applicationContext;

   @Override
   public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
      SpringUtils.beanFactory = beanFactory;
   }

   @Override
   public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
      SpringUtils.applicationContext = applicationContext;
   }

   /**
    * 获取对象
    *
    * @param name
    * @return Object 一个以所给名字注册的bean的实例
    * @throws BeansException
    */
   @SuppressWarnings("unchecked")
   public static <T> T getBean(String name) throws BeansException {
      return (T) beanFactory.getBean(name);
   }

   /**
    * 获取类型为requiredType的对象
    *
    * @param clz
    * @return
    * @throws BeansException
    */
   public static <T> T getBean(Class<T> clz) throws BeansException {
      T result = (T) beanFactory.getBean(clz);
      return result;
   }

   /**
    * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true
    *
    * @param name
    * @return boolean
    */
   public static boolean containsBean(String name) {
      return beanFactory.containsBean(name);
   }

   /**
    * 判断以给定名字注册的bean定义是一个singleton还是一个prototype。 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
    *
    * @param name
    * @return boolean
    * @throws NoSuchBeanDefinitionException
    */
   public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
      return beanFactory.isSingleton(name);
   }

   /**
    * @param name
    * @return Class 注册对象的类型
    * @throws NoSuchBeanDefinitionException
    */
   public static Class<?> getType(String name) throws NoSuchBeanDefinitionException {
      return beanFactory.getType(name);
   }

   /**
    * 如果给定的bean名字在bean定义中有别名，则返回这些别名
    *
    * @param name
    * @return
    * @throws NoSuchBeanDefinitionException
    */
   public static String[] getAliases(String name) throws NoSuchBeanDefinitionException {
      return beanFactory.getAliases(name);
   }

   /**
    * 获取aop代理对象
    *
    * @param invoker
    * @return
    */
   @SuppressWarnings("unchecked")
   public static <T> T getAopProxy(T invoker) {
      return (T) AopContext.currentProxy();
   }

   /**
    * 获取当前的环境配置，无配置返回null
    *
    * @return 当前的环境配置
    */
   public static String[] getActiveProfiles() {
      return applicationContext.getEnvironment().getActiveProfiles();
   }

   /**
    * 获取当前的环境配置，当有多个环境配置时，只获取第一个
    *
    * @return 当前的环境配置
    */
   public static String getActiveProfile() {
      final String[] activeProfiles = getActiveProfiles();
      return StringUtils.isNotEmpty(activeProfiles) ? activeProfiles[0] : null;
   }
}
